White WHS Headlight Bulb Size

The White WHS headlight bulb size chart specifies high beam and low beam bulb options including 9004, H6024, and H4651 for high beam applications, along with 9004, H6024, and H4656 for low beam configurations. The replacement chart covers vehicle production years from 1981 to 1988 with corresponding bulb size data.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

Years	Bulb Size
1988	9004 (With Composite Headlamps)
1988	H6024 (With Sealed Beam Headlamps)
1981-1987	9004 (Conventional)
1981-1987	H4651 (Except Conventional)

Low Beam Headlight

Years	Bulb Size
1988	9004 (With Composite Headlamps)
1988	H6024 (With Sealed Beam Headlamps)
1981-1987	9004 (Conventional)
1981-1987	H4656 (Except Conventional)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament halogen bulb with P29t base. 12V, 65W/45W.	9004
ANSI standard (US & Canada). 7-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6024
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656

Other Locations

Additional Notes

The 9004 is a dual-filament halogen bulb rated at 12V with a 65W high beam filament and a 45W low beam filament, fitted with a P29t base. Its dual-filament design allows a single bulb to serve both the high beam and low beam functions within a composite headlamp assembly.
The White WHS uses the 9004 bulb for both high beam and low beam positions in conventional and composite headlamp configurations, meaning one bulb type handles both lighting functions simultaneously in those assemblies.
The H4651 and H4656 are 4x6-inch rectangular sealed beam units operating at 12V. In sealed beam designs, the lens, reflector, and filament form a single sealed unit, so the entire assembly is replaced rather than an individual bulb. The H4651 is specified for the high beam position, while the H4656 is specified for the low beam position.
The H6024 is a 7-inch round sealed beam unit operating at 12V. Like the H4651 and H4656, it is a complete sealed assembly and is replaced as a whole unit rather than by swapping an internal bulb.
For the 1981-1987 White WHS, the non-conventional headlamp configuration uses the H4651 for high beam and the H4656 for low beam. Although both are 4x6-inch rectangular sealed beam units, they are not interchangeable between positions due to differing filament and beam pattern specifications.
In 1988, the White WHS headlamp system changed to distinguish between composite and sealed beam configurations. Composite headlamps use the 9004 bulb, while sealed beam headlamps use the H6024 unit, representing two distinct and non-interchangeable fitment types for that year.
All bulb and sealed beam types listed across the White WHS specifications conform to ANSI standards applicable in both the United States and Canada, indicating standardized physical and electrical specifications across the product range.